我们以前曾解释过，XMPP是随着即时消息兴起的一种实时通讯协议(link)。
As we've explained in the past, XMPP is a real-time communication protocol popularized by Instant Messaging.
至于复制内容协议的规定，一般是如果你的新闻稿在新闻通讯社上公布了，那也可以在你的网站上公布，这是最常见的情况。
As for dealing with duplicate content when your press release is published on your own site as well as on the wire service, it's a pretty common situation.
对实时通讯而言，SIP协议是最为有效的。
For real time communications, protocols such as SIP are the most effective.
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